Final answer:
The exact date and location of Henrietta and Day's marriage are unspecified in the provided excerpts, making it impossible to provide a detailed answer based on the information given.
Step-by-step explanation:
The specific details of when and where Henrietta and Day got married are not provided in the provided information, making it impossible to determine the exact date and location of their marriage. However, the text does mention that 'They were married three weeks later' in relation to an unspecified starting point. This implies that the wedding took place three weeks after a certain event, which itself is not detailed in the excerpts. Similarly, there is a reference to Henrietta Johnston, a historical figure and the first known female artist in the southern colonies, but there is no direct connection to the marriage of Henrietta and Day in the information provided. Without additional context or historical records specific to Henrietta and Day, an accurate answer cannot be given.